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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1965db4f97722a5f5e9452ba67f2466be8eef854d078a7189f2d221690cdfbc' 
  AND token = 'sD7PmV7J2nZqxr23FTsA6nFClSUJKJylkZbwUXMV/uk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}